Why spend more at the gas pump when you can easily spend less? The team at The Family Handyman shares this list of DIY tricks for a noticeable difference in your fuel costs. The savings are based on driving 20,000 miles per year, in a car that gets 20 mpg, with gasoline priced at $3.75 a gallon.

Save $900 by Keeping Your Tires at the Right Pressure

Surveys show that 60 percent of the vehicles on the road have tires that are underinflated by at least 30 percent. That's at least 9 psi below the manufacturer's recommended pressure. That can cost you almost 7 percent in wasted fuel ($245 per year, or 24¢ per gallon). Plus, low air pressure causes premature tire wear, and that can cost almost $300 over the life of the tires. For best results, check your tire's air pressure with a digital pressure gauge (about $10 at any auto parts store) and fill to the recommended pressure shown on the decal inside the driver's door or on the driver's door pillar.

Change Spark Plugs Before They're Due

If your 100,000-mile spark plugs have 80,000 miles on them, they're 80 percent worn. Misfires and incomplete combustion occur more frequently during that last 20,000 miles, costing you almost $562.50 in wasted fuel. You have to replace your spark plugs anyway, so do it early and pocket the savings. Even if you have to replace the plugs one extra time over the life of your car, you'll still come out way ahead. And don't automatically assume your plugs are good for 100,000 miles. Many four-cylinder engines require new spark plugs at either 30,000 or 60,000-mile intervals.

Save $350 by Changing Your Air Filter Early and Often

Your engine sucks in 14 million gallons of air through the filter every year. On older vehicles (pre-1999) a dirty air filter increases fuel usage by almost 10 percent ($350 per year, or 35¢ per gallon). On newer vehicles, the computer is smart enough to detect the lower airflow, and it cuts back on fuel. So your engine will lack power and pick-up. Check the filter when you change your oil and replace it at least once a year, or more if you drive in dirty, dusty conditions.

Save $177.50 by Keeping Your Car Aligned

If your tires are bowed out of alignment by just .017 in., it's the equivalent of dragging your tire sideways for 102 miles for every 20,000 you drive. That'll cost you $187.50 a year in wasted gas. It will wear your tires faster, costing you $70 more a year.

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Here's an easy way to check your alignment without taking your car in to the shop. Buy a tread depth gauge ($2) and measure the tread depth on both edges of each tire (rear tires too). If one side of the tire is worn more than the other, your car needs to be aligned. An alignment costs about $80, so you'll still save $177.50 the first year alone.

Lead Foot = Lead Wallet

Hard acceleration in stop-and-go driving costs you 20 percent in gas mileage. If you live your life in rush hour traffic and like to put the pedal to the metal, spend all your extra time at the next stoplight figuring out how you could have spent the $750 a year you're wasting (70¢ per gallon).

Replace a Broken or Missing Spoiler

The plastic air dam (aka "spoiler") that's broken or missing wasn't just for a sporty look. If your car had an air dam, driving without it or with a damaged one can reduce your gas mileage. The air dam literally "dams off" airflow to the undercarriage of your car, forcing the air up and over the hood. That helps your car cut through the air with less drag. It also increases airflow to the A/C condenser and radiator, reducing the load on your car's electrical system. Contact a junkyard or visit certifit.com to get a replacement air dam.

Speed Kills Your Gas Mileage and Your Wallet

Yes, you've heard it before, but how about some real world numbers to drive the point home? Aerodynamic drag is a minor concern in city driving, but it really kills your gas mileage at speeds over 55 mph. In fact, increasing your speed to 65 increases drag by 36 percent! If you do a lot of highway driving, getting to your destination a few minutes early could cost you an extra $500 to $600 a year. Keep it closer to 55 mph and use your cruise control. It will pay off.

Replace Your Oxygen Sensor Before the Light Goes On

Oxygen sensors monitor the efficiency of combustion by tracking the amount of oxygen remaining in the exhaust. But they degrade over time and that can cost you up to 15 percent in gas mileage. When they fail, the computer lights up your "service engine soon" light, forcing you to incur an $80 diagnostic fee. On pre-1996 vehicles, replace your oxygen sensor every 60,000 miles to keep your mileage at its peak. On 1996 and newer vehicles, replace the sensors every 100,000 miles. Oxygen sensors cost about $60 each. Some vehicles have as many as four, but the sensors installed behind the catalytic converter rarely fail.

The Family Handyman is the DIYers best friend, offering a variety of print and digital resources for do-it-yourself homeowners. Our forte is accurate and complete how-to instructions for improving homes, yards and vehicles. We publish The Family Handyman magazine, the oldest and largest publication for DIYers, and a variety of newsstand publications in addition to this web site. The Family Handyman is part of the Reader's Digest Association family of brands, including Taste of Home, Birds & Blooms, and of course Reader's Digest.